OVERVIEW OF PLASTIC SUBSTRATES FOR PRINTED ELECTRONICS

Transcription

1 OVERVIEW OF PLASTIC SUBSTRATES FOR PRINTED ELECTRONICS Robert Rus:n Sr. Applica+on and Market Development Manager Special thanks to: Karl Rakos Bill MacDonald

2 Melinex polyester film Mylar polyester film Teijin Tetoron polyester film Teonex PEN polyester film How many times a day do you rely on PET and PEN polyester films from DuPont Teijin Films?

3 DTF s Flexible Electronics Defini+on Flexible Electronics includes any market or applica+on in which electronic components are manufactured, either printed or not, directly on flexible film providing manufacturing or end use benefits. Plastic Electronics is a state of mind Professor Donal Bradley

4 Current targeted Flex Electronic markets Flex Display Electrophore+c, electrochromic, electrowegng, OLED, flexible backplanes Touch Screen Mainly projected capaci+ve Smart Cards Ligh+ng Solid state either LED or OLED Ac+ve Windows Medical

5 Printed Electronics Exist Today Membrane Touch Switch Automo+ve MTS, eg seat sensors PEN allows higher temperature specifica+ons Flexible Printed Circuits / Flat Flexible Cable Automo+ve wiring harness replacement with flat cables LED rear light clusters and daylight running lights Op+cal Displays Electroluminescent lamps and next genera+on displays

6 Printed Electronics Today Security, ID, health cards Passports Protective Labels Medical Test strips

7 Displays (Flat Panel & Flexible) LCD Reflector Prism Light Gain Diffuser Diffuser Protect Films Touch Screen Flexible Display Smart Phones E Readers Tablets Touch Screen

8 Solid State Ligh+ng OLED Diffuser Reflector Barrier base film LED Diffuser Reflector

9 Durable Cards Na+onal ID University & College ID Driver Licenses Financial Smart Cards Transit Overlay Core

10 Emerging Printed Electronics

11 DTF substrates enabling device development DTF has been very ac+ve in the Flexible Displays arena for a number of years and have a proven track record in high quality substrates for flexible displays ITRI Flexible Displays Center Plas.c Logic Kent Display 1.E-05 W=100um Vsd=10.1V 1.E-06 Isd/(W/L) (A) 1.E-07 1.E-08 1.E-09 1.E-10 1.E-11 1.E-12 1.E-13 W [ m] L [ m] E Vg(V) Polymer Vision HP/SAIL Process Samsung Electronics Pictures courtesy of companies named above

12 Emerging Printed Electronics

13 (Flexible) Electronics Thin Film Transistors Printed Electronics Sensors Slide shown courtesy of Flexible Display Centre, ASU

14 Factors Influencing Substrate Choice Property Set Simple circuitry Organic AM backplanes More demanding property set Inorganic AM backplanes Increasing complexity of substrate structure OLED Lighting

15 Key Challenges for Engineered Substrates into Flexible Electronics Applica+ons Low Coefficient of Thermal Expansion Low Shrinkage Upper Temperature for Processing Surface smoothness Barrier Solvent Resistance Moisture Resistance Clarity Rigidity Conduc+ve layers Commercial availability Substrates for the more demanding applica+ons are likely to be mul+layer structures containing both organic and inorganic layers

16 Factors Influencing Film Choice Substrate Proper+es Films grouped by thermal properties Temp C Semi-crystalline Amorphous Amorphous,solvent cast Tg C Tm C PET PEN Polycarbonate Polyarylate Polyethersulphone Fluorene Polyester Polyimide Substrates

17 Surface Roughness and Quality

18 Surface analysis Regular Printer Paper

19 Surface analysis Tyvek Graphic Paper Is porosity a factor in your design?

20 Surface analysis Tyvek Graphic Paper

21 Stainless Steel Stainless steel Requires planarising coa+ng and insula+ng coa+ng Picture courtesy of UDC

22 Surface analysis Display Grade PET Film Note: scale is now +/- 15 nm

23 Melinex ST506 Benefit of Planarisa+on Pretreat on Melinex ST506 gives good adhesion to subsequent coatings But at expense of surface roughness Ra 1.53nm Sample size 594micron Planarised Melinex ST506 Very smooth surface-on a par with Polished glass mirror Ra 0.6nm Sample size 608 microns

24 Enhancing Surface Roughness with Fillers Unfilled Clear Handlable Slightly Hazy Increasing Roughness Hazy Matte Rough Handleable Very Hazy

25 Surface Roughness from Addi+ve Packages Standard Packaging Film Electronics Grade Film White Opaque Film Laminating Film

26 Does Rougness Impact Circuitry? QVGA asi TFT array built on PEN Planariser Uncoated Heat stabilised PEN Planarised Heat stabilised PEN Slide shown courtesy of Flexible Display Centre, ASU

27 Surface Energy

28 Surface Energy dynes/cm2, D PET LDPE BOPP HDPE OPS Cell PVC

29 Effect of Surface Energy and Primer Chemistry Surface chemistry and surface energy play a major role in adhesion, interlayer stress, and print quality.

30 Mismatched Surface Chemistry Silver ink, screen printed on PET, with mismatched solvent system. Must System design your materials to match INKS to substrate